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Definition of caustic. 1 : capable of destroying or eating away by chemical action : corrosive The chemical was so caustic that it ate through the pipe. 2 : marked by incisive sarcasm a caustic film review caustic humor.
Wiktionary(0.00 / 0 votes)Rate this definition: 1  caustic(Noun) Any substance or means which, applied to animal or other organic tissue, burns, corrodes, or destroys it by chemical action; an escharotic. 2  caustic(Noun) The envelope of reflected or refracted rays of light for a given surface or object.